Manufacture of filaments for incandescent electric lamps.



No. 679,803. Patented Aug.. 6,-I9OL W. L. VUELKER.

MHUFACTURE 0F FILAMENTS FR INCANDESCENT ELECTRIC LAMPS.

(Application led Nov. 19, 1900.)

(lo Model.)

OFFICE.

llll ELECTilC NMFS.

l 6T9,B053, dated August 6, 1901. 'Lr vm-AJ nel fzlsl epplrminn tiled November 19,1900. Serial l mm ineloeed within e tight-fitting e ll, formed of glass or of thel 5o mince as elle cylinder. A small if; ebrucfk between the extremities ne ff, eo as to produce a high ultliouln much pressure, the l u' boing meanwhile charged 5:, Y n or carbureted. hydrogen or r of :l hydrocarbon or of the metal l 13o form Lhe metallic base of the ear- 'llle Spool e of carbon. filament is preily mounted .in a gue-tight container f, to 6e roo hydroearbm or other gas is admmed by of a oook g,'the said gas pas su ellis eontainer through the perforae. elle maroon o into the Ainterior of the ,lor o and globe or vessel d. The ezt-"65 my of the carbon filament having been rl: rough 'alle carbon electrode and car- 6mm or reel h, the thread or ,lila-` rawu through the electric are at a, penning upon the strength of theV 7o A 'lise efobid resulting has a metalli a u 'noesaud although ofahighly-crystah I' meure may when out; into the requiredl lengths be readily bene into horseshoe form v l and mounted in lneandesciirg-lamp globes 754 y, la; me ordinary manner. The temperature l 2 which should he employed at the nal stage of Comering the filament into carbid will very slightly when working with different of moi/als. 'lhetemperature approprl-` 8e Y :uw may, bam'ever, be determined by that at vl incipient, fuelon of the metallic oxd or exif] e takes place g lie carbone o b may be mounted 'n a simi* im manner to those in an ordinary eleetrie- 85 are lamp and their regulation effected by snitolsle mechanism or by hand. In `the accompanying illustration the carbon bis held in a g eoelcel, i, carried by a transverse bar k, the

; lamer being supported by rods Z l, while the 9o f our 'lon o is carried by the plate m, in which fue supporting-rods n 'n terminate.

The method of manufacture hereinbefore eecrlbod is well adapted for use in the p ronemen o 'i ncaudescing-lamp filaments where 95 er nmnlnru, iluminan, zirconium, or beryllium,

either singly, in combination or in combination with other metals, is employed as the :metallic base of the carbid.

What I claim as my invention, and desire 5 to secure by Letters Patent, is

The herein-described metho of producing carbid filaments for electric ineandescing lamps consisting in treating a earbou filament in an electric are in the presence of va- .-o por Aof the metal orrmetals constituting the mamma-hasn nfthe carbid' to be produced,

the said carbon filament boing eonverted into graphite and than into carbid at n single op eration, substantially as eet ier-th In testimony whereof fl have signed my r 5 name to this specification in the presence of two subscribing witneezsee;

WILLAM .LAW HENU' Y() ELEER.

Witnesses:

EDMUND S. SNEWIN, WM. O. BRoWM 

